Stone, Bob
Successful direct marketing methods : interactive, database, and customer-based marketing for digital age
McGraw-Hill, 2008
 Buku Teks
Sistem database untuk perencanaan kebutuhan material
Fakultas Teknik Universitas Indonesia, 1996
 UI - Skripsi Membership
Farah Ayu Ridhani
Aplikasi direct method cone penetration test untuk wilayah Jakarta = The application of direct method cone penetration test in Jakarta
Fakultas Teknik Universitas Indonesia, 2019
 UI - Skripsi Membership
Roberts, Mary Lou
Direct marketing management
Prentice-Hall, 1989
 Buku Teks
Stone, Bob
Successful Direct Marketing Methods
NTC Business Book, 1988
 Buku Teks